Label peeling device, fluid ejection device, and label peeling method

ABSTRACT

A holding unit holds label paper conveyed from a label printer that ejects ink onto the label paper. A peeling unit is disposed to the label paper conveyance path downstream from the holding unit, and peels labels from the liner of the label paper. The peeling unit can move bidirectionally between a start peeling position and an end peeling position. A peeling member folds back only the liner portion of the label paper. A peeling conveyance roller disposed downstream from the peeling member on the label paper conveyance path conveys the label paper. The peeling member moves from the start peeling position to the end peeling position by being pushed by the label paper conveyed by the peeling conveyance roller while the label paper is still held by the holding unit.

Priority is claimed under 35 U.S.C. § 119 from Japanese Application No. 2014-125894 filed on Jun. 19, 2014, which is hereby incorporated by reference in its entirety.

BACKGROUND

1. Technical Field

The present disclosure relates to a label peeling device that separates the labels from the liner backing of label paper.

2. Related Art

Label peeling devices that have a take-up roller for rewinding label paper conveyed from a label printer, a motor that drives the take-up roller, a peeling plate disposed between the label printer and the take-up roller to peel labels from the liner backing by bending the liner, an air cylinder that moves the peeling plate forward and back in the conveyance direction of the label paper, and a suction pad that holds the printing surface of the label, are known from the literature. When the printing surface of a label is held by the suction pad, this label peeling device separates the label from the liner by the air cylinder moving the peeling plate toward the label printer while rewinding the liner onto the take-up roller. See, for example, JP-A-2009-012851.

When the peeling member is moved by an air cylinder while rewinding the label paper by driving a motor as in the label peeling device described in JP-A-2009-012851, the peeling member may move quickly irrespective of how fast the label paper is being rewound. Because the peeling member separates from the label paper when this happens, the liner is not folded back by the peeling plate and the label cannot be peeled from the liner.

SUMMARY

In some embodiments, a label peeling device has a peeling unit that peels labels from label paper fed from a fluid ejection device that ejects fluid onto the label paper, the label paper including labels and a liner to which the labels are affixed. The peeling unit includes: a peeling member is configured to move bidirectionally between a start peeling position and an end peeling position, and fold back the liner portion of the label paper; and a conveyance unit that is disposed in the conveyance path of the label paper downstream from the peeling member and conveys the label paper. The peeling member is configured to move between the start peeling position and the end peeling position.

In some embodiments, a fluid ejection device includes: a fluid ejection unit that ejects fluid onto the label paper, the label paper including labels and a liner to which the labels are affixed; and a peeling unit that is disposed in the label paper conveyance path and peels labels from label paper. The peeling unit includes a peeling member that is configured to move between a start peeling position and an end peeling position, and fold back the liner; and a conveyance unit that is disposed in the label paper conveyance path downstream from the peeling member and conveys the label paper. The peeling member is configured to move between the start peeling position and the end peeling position.

In some embodiments, a peeling method of a label peeling device having a peeling member that peels labels from label paper fed from a fluid ejection device that ejects fluid onto the label paper, the label paper including labels and a liner to which the labels are affixed, and a conveyance unit that is disposed downstream from the peeling member and conveys the label paper. The peeling method includes moving the peeling member from the start peeling position to the end peeling position to peel the labels from the liner.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an oblique view of a label peeling device according to a preferred embodiment of the invention when not installed to the label printer.

FIG. 2 is an oblique view of the label peeling device when installed to the label printer.

FIG. 3 illustrates the configuration of the label peeling device and label printer.

FIG. 4 is an oblique view of the label peeling device.

FIG. 5 is a section view of the label peeling device.

FIG. 6 is an oblique view of the peeling unit.

FIG. 7 is an oblique view of the peeling unit from a different angle than in FIG. 6.

FIGS. 8A and 8B are an oblique views describing the rocking action of the peeling member.

FIG. 9A illustrates operation of the peeling unit moving unit when the peeling unit moves from the end peeling position to the start peeling position, and 9B illustrates operation of the peeling unit moving unit when the peeling unit moves from the start peeling position to the end peeling position.

FIG. 10 is a block diagram of the control system of the label peeling device.

FIG. 11 is used to describe the peeling distance, additional distance, and peeling unit movement distance.

FIGS. 12A-12D illustrate the operation that peels a label from the liner in a label peeling device after recording an image on the label in a label printer.

FIGS. 13A-13D show the continuation of the operation shown in FIGS. 12A-12D of peeling a label from the liner in a label peeling device after recording an image on the label in a label printer.

FIGS. 14A-14C illustrate the operation controlling the peeling feed roller based on output from a slack detector when feeding the label paper forward.

FIGS. 15A-15C illustrate the operation controlling the peeling feed roller based on output from a slack detector when feeding the label paper in reverse.

DESCRIPTION OF EMBODIMENTS

Exemplary embodiments of a label peeling device according to the present invention are described below with reference to the accompanying figures.

Note that the disclosure is described with reference to the top, bottom, left, right, front direction, and rear as shown in the figures, but these directions are for descriptive convenience only, and the invention is not limited to these directions.

As shown in FIG. 1 to FIG. 3, a label peeling device 1 according to at least one embodiment of the invention is installed at the front of the label printer 100, or more particularly to the paper exit side of the label printer 100. The label printer 100 is therefore described first below.

Based on image data received from a communicatively connected computer (not shown in the figure), the label printer 100 records images on the label paper P using an inkjet printhead. Note that the label printer 100 can also be used without the label peeling device 1 installed. The label peeling device 1 is therefore installed in the label printer 100 as an optional device.

The label paper P has a continuous web liner Pa, and multiple labels Pb affixed to the liner Pa with a substantially equal gap between adjacent labels Pb. The liner Pa and labels Pb are not limited to any particular type of material. The label paper P in this embodiment is provided as roll paper R, but is not so limited and may be fanfold paper, for example.

The label printer 100 has a basically rectangular box-like case 101. A roll paper cover 102, discharge table 103, release lever 104, power switch 105, operating panel 106, and ink cartridge cover 107 are disposed to the front of the case 101 where the paper exit is located. A roll paper supply unit 108, paper feed roller 109, platen 111, and recording head 112 are disposed inside the case 101.

The recording head 112 in this example is an example of a fluid ejection unit.

The roll paper cover 102 is normally locked in a position covering the front of the roll paper supply unit 108. To replace the roll paper R, for example, the user operates the release lever 104 to unlock the roll paper cover 102. As a result, the user can rotate the roll paper cover 102 together with the discharge table 103 and release lever 104 by forward pivoting at the bottom of the roll paper cover 102, and thereby open the roll paper supply unit 108.

If the label peeling device 1 is not installed, the discharge table 103 functions as a support for receiving the discharged label paper P. If the label peeling device 1 is installed, the discharged label paper P is not received by the discharge table 103, and is instead passed to the label peeling device 1. The discharge table 103 is basically trapezoidal when seen from the side, and engages a table receiving part 17 (described further below with respect to FIG. 5) of the label peeling device 1.

The roll paper R is loaded into the roll paper supply unit 108. The paper feed roller 109 is a nip roller. The paper feed roller 109 feeds the label paper P forward, that is, pulls the label paper P from the roll paper supply unit 108 and conveys it toward the recording head 112. The paper feed roller 109 can also back feed the label paper P, that is, convey the label paper P back into the roll paper supply unit 108. The recording head 112 has a plurality of inkjet heads for multiple colors of ink, such as the four CMYK colors. The recording head 112 ejects ink and records color images on the labels Pb of the label paper P conveyed over the platen 111. After passing the recording head 112, the label paper P is conveyed to the label peeling device 1 installed to the front of the label printer 100.

The label peeling device 1 is described next. The label peeling device 1 peels the labels Pb from the liner Pa of the label paper P conveyed from the label printer 100.

As shown in FIG. 4 and FIG. 5, the label peeling device 1 has a support base 2, holding unit 3, left guide rail 4, right guide rail 5, peeling unit 6, peeling unit moving unit 7, linear encoder 8, slack detector 9, and label detector 11.

Note that the peeling unit 6 is an example of the peeling unit in the accompanying claims, and the peeling unit moving unit 7 is an example of a return unit.

The support base 2 supports other parts of the label peeling device 1. The support base 2 includes a base plate 12, left panel 13, a right panel (not shown in the figure), a back panel 15, and an inclined panel 16.

The base plate 12 is substantially rectangular. The left panel 13 and the right panel are affixed to the left and right edge areas of the base plate 12. The left panel 13 and the right panel are also substantially rectangular.

The table receiving part 17 is formed as a substantially trapezoidal notch in the top of the back end of the left panel 13 and right panel. When the label peeling device 1 is installed to the label printer 100, the table receiving part 17 accepts the left and right sides of the discharge table 103. A drive pulley 53 and driven pulleys 54 are rotatably supported by the right panel.

The inclined panel 16 is disposed between the left panel 13 and right panel at an angle descending toward the front of the label peeling device 1. After the labels Pb are removed by the peeling unit 6, the liner Pa is received by the inclined panel 16 and is fed at an angle descending toward the front along the top of the inclined panel 16.

The holding unit 3 has a holding position where it holds the label paper P conveyed from the label printer 100, and a release position where it does not hold the label paper P. The holding unit 3 includes a support pedestal 18, a gripping member 19, and a gripping motor 21 (see FIG. 10).

The support pedestal 18 is attached to the top back part of the left panel 13 and right panel spanning the gap between the left panel 13 and right panel. The gripping member 19 is disposed substantially in the middle between the left and right ends of the support pedestal 18, and is substantially rectangular and long left to right. The gripping member 19 can move to and away from the support pedestal 18 between a holding position (FIG. 12D) where the label paper P is held with the support pedestal 18, and a release position (FIGS. 12A-12C) where the label paper P is not held.

The gripping motor 21 is the drive source for moving the gripping member 19 between the holding position and the release position. Note that an air cylinder, solenoid, or other drive means other than a motor may be used as the drive source that moves the gripping member 19 between the holding position and the release position. The user may also manually move the gripping member 19 between the holding position and release position.

The left guide rail 4 and right guide rail 5 extend on the front-rear axis, and guide movement of the peeling unit 6 between the front and back. The front end of the left guide rail 4 is supported by the left panel 13 through a support bracket 22, and the back end of the left guide rail 4 is supported by the left panel 13 through the support pedestal 18. The front end of the right guide rail 5 is likewise supported by the right panel through another support bracket 22, and the back end of the right guide rail 5 is supported by the right panel through the support pedestal 18.

The peeling unit 6 peels the labels Pb from the liner Pa of the label paper P conveyed from the label printer 100. The peeling unit 6 is disposed in front of the holding unit 3, that is, downstream from the holding unit 3 on the conveyance path of the label paper P. Note that upstream and downstream as used herein are referenced to the normal forward conveyance direction of the label paper P.

The peeling unit 6 can move bidirectionally between a start peeling position (FIGS. 12A-12D) separated from the holding unit 3, and an end peeling position (FIGS. 13A and 13B) near the holding unit 3. The peeling unit 6 peels the labels Pb from the liner Pa by moving from the start peeling position to the end peeling position while the label paper P is held by the holding unit 3. As a result, the labels Pb are peeled from the liner Pa from the downstream side to the upstream side of the label paper P conveyance path.

Note that the end peeling position is fixed in this embodiment, and the start peeling position moves according to the peeling unit movement distance C described below.

As shown in FIG. 4 to FIG. 7, the peeling unit 6 includes a first peeling part 23 and a second peeling part 24. The second peeling part 24 is disposed pivotably to the first peeling part 23 on a cover rail 25 at the bottom of the second peeling part 24. More specifically, the second peeling part 24 pivots between a closed position (see FIG. 4) closing the front of the first peeling part 23, and an open position (see FIG. 6) that opens the front of the first peeling part 23. When setting the label paper P in the peeling unit 6, the user rotates the second peeling part 24 from the closed position to the open position. The user then inserts the leading end of the label paper P between the peeling drive roller 32 (described further below) of the first peeling part 23, and the driven peeling roller 48 (described further below) of the second peeling part 24. The user then returns the second peeling part 24 to the closed position. This loads the label paper P in the peeling unit 6. the liner Pa from which the labels Pb are removed is fed between the first peeling part 23 and second peeling part 24 to the inclined panel 16.

The first peeling part 23 includes a peeler frame 26, a guide mount 27, a peeling member 28, a peeling member support 29, a peeling conveyance motor 31, and a peeling drive roller 32.

The peeler frame 26 supports the other parts of the first peeling part 23. The peeler frame 26 is basically like a box that is open to the top and front.

The guide mount 27 is for mounting the peeling unit 6 so that is slides in the front and back direction on the left guide rail 4 and right guide rail 5. The guide mount 27 includes a left mount 33, a right mount 34, and a connector 35. The connector 35 extends left and right, and connects the left mount 33 and the right mount 34.

The left mount 33 is fastened to the left top end of the peeler frame 26. A left guide engaging part 36 that is U-shaped when seen from the front is disposed to the front end of the left mount 33. The left guide engaging part 36 engages the left guide rail 4 from the inside (right side).

The right mount 34 is fastened to the right top end of the peeler frame 26. A right guide engaging part 37 that is U-shaped when seen from the front is disposed to the front and back ends of the right mount 34. The right guide engaging parts 37 engage the right guide rail 5 from the inside (left side).

A guide roller 38 is disposed on the outside side (right side) of each right guide engaging part 37. When the left guide engaging part 36 and right guide engaging parts 37 are respectively engaged with the left guide rail 4 and right guide rail 5, and the peeling unit 6 moves between the front and back, the guide rollers 38 roll along the outside (right side) of the right guide rail 5.

Note than an endless belt 56 described further below is fastened to the bottom of the right mount 34. A linear detector 59 described further below is disposed above the right mount 34.

When the peeling unit 6 moves from the start peeling position to the end peeling position, the peeling member 28 peels a label Pb from the liner Pa. Only the liner Pa part of the label paper P is bent back by the peeling member 28. The peeling member 28 is disposed on the top of the peeling member support 29 in front of the connector 35 between the left mount 33 and right mount 34.

The narrow flat back side of the peeling member 28 extends in the left and right directions, and bends 90 degrees or more down. The peeling member 28 thus has a peeling edge 39 along the back forming an acute angle.

The liner Pa is folded back at this peeling edge 39. A rocking rail (not shown in the figure) is formed protruding down from the middle of the peeling member 28 between the left and right ends. This rocking rail engages a rocking channel (not shown in the figure) disposed on the top of the peeling member support 29. As a result, the peeling member 28 can rock through a plane substantially parallel to the top of conveyance surface from the holding unit 3 to the peeling member 28, that is, the top of the peeling member 28.

If the peeling member 28 is stationary and the label paper P is set at an angle to the peeling member 28 as shown in FIG. 8A, the label paper P will lift away from the peeling member 28 and peeling the labels Pb may not be possible. However, because the peeling member 28 in this embodiment of the invention can rock as shown in FIG. 8B, the peeling member 28 will rock and follow the label paper P even if the label paper P is set at an angle to the peeling member 28. As a result, labels Pb can be appropriately peeled from the liner Pa by suppressing separation of the label paper P from the peeling member 28.

A transverse middle member 41 is disposed between the peeling member 28 and connector 35. A longitudinal middle member 42 is disposed between the left and right ends of the peeling member 28 and the left mount 33 and right mount 34. A gap allowing the peeling member 28 to move is provided between the peeling member 28 and the transverse middle member 41, and between the peeling member 28 and the longitudinal middle members 42.

The peeling member support 29 is disposed between the left and right walls of the peeler frame 26. A rocking channel engaged by the rocking rail is disposed on the left-right middle part of the top of the peeling member support 29 as described above. A detector window 43 is opened in the front of the peeling member support 29 in the middle between the left and right ends. The detection probe 44 of the slack detector 9 protrudes from the detector window 43.

The peeling conveyance motor 31 drives the peeling drive roller 32 forward and reverse. The peeling conveyance motor 31 is fixed to the inside of the left wall of the peeler frame 26. A transmission gear 45 that transfers drive power from the peeling conveyance motor 31 to the peeling drive roller 32 is disposed at the outside of the left wall of the peeler frame 26.

The peeling drive roller 32 and the driven peeling roller 48 disposed on the second peeling part 24 embody a peeling conveyance roller 46, which is a nip roller unit, that rotates and conveys the label paper P.

The peeling conveyance roller 46 is located on the downstream side of the peeling member 28 on the label paper P conveyance path. The peeling conveyance roller 46 can convey the label paper P forward (forward feed) or in reverse (back feed). The peeling drive roller 32 extends left and right with the ends supported rotatably by the left wall and right wall of the peeler frame 26.

The second peeling part 24 includes a peeler cover 47 and the driven peeling roller 48.

The peeler cover 47 is shaped like a box that is open near the bottom of the back. The peeler cover 47 is attached by the cover rail 25 rotatably to the peeler frame 26.

The label detector 11 is disposed at the top of the peeler cover 47.

The driven peeling roller 48 extends in the left and right directions, and the ends thereof are rotatably supported by the peeler cover 47. The driven peeling roller 48 rotates following the peeling drive roller 32.

The driven peeling roller 48 and peeling drive roller 32 are integrated with the peeling member 28 through the peeler frame 26. More specifically, the peeling conveyance roller 46 embodied by the peeling drive roller 32 and driven peeling roller 48 moves in unison with the peeling member 28 bidirectionally between the start peeling position and end peeling position. Therefore, change in the turning angle of the liner Pa created by the peeling member 28 and peeling conveyance roller 46 when the peeling member 28 moves to and away from the holding unit 3 can be suppressed. See FIG. 13A. As a result, labels Pb can be peeled consistently from the liner Pa.

By feeding the label paper P forward by the peeling conveyance roller 46, the peeling unit 6 moves itself from the start peeling position to the end peeling position. More specifically, when the label paper P is held by the holding unit 3 and the label paper P is fed forward by the peeling conveyance roller 46, the label paper P becomes taut. The peeling unit 6 is then pushed by the taut label paper P and moves from the start peeling position to the end peeling position. More specifically, the tension on the label paper P causes the peeling unit 6 to move from the start peeling position to the end peeling position.

After the peeling unit 6 moves to the end peeling position, the peeling unit moving unit 7 moves the peeling unit 6 back to the start peeling position.

The peeling unit moving unit 7 includes a peeling unit moving motor 51, a moving gear 52, a drive pulley 53, two driven pulleys 54, a tension pulley 55, the endless belt 56, and a torque limiter 57. The moving gear 52, drive pulley 53, two driven pulleys 54, tension pulley 55, and endless belt 56 embody a power transfer mechanism that transfers drive power from the peeling unit moving motor 51 to the peeling unit 6.

The peeling unit moving motor 51 is the drive source for moving the peeling unit 6 from the end peeling position to the start peeling position. The peeling unit moving motor 51 is fastened to the base plate 12. The moving gear 52 meshes with the output gear (not shown in the figure) fastened to the output shaft of the peeling unit moving motor 51.

The drive pulley 53 has teeth, and is fastened coaxially to the right side of the moving gear 52. The drive pulley 53 and moving gear 52 are rotatably supported at the bottom of the right panel.

The two driven pulleys 54 are rotatably supported at the top of the right panel. The two driven pulleys 54 are disposed at the front and back along a line substantially parallel to the right guide rail 5.

The tension pulley 55 is disposed between the drive pulley 53 and the rear driven pulley 54. The tension pulley 55 pushes against the outside surface of the endless belt 56, causing the endless belt 56 to curve around the tension pulley 55, which applies tension to the endless belt 56.

The endless belt 56 has teeth, and is mounted on the drive pulley 53 and two driven pulleys 54. The right mount 34 described above is fastened to the endless belt 56 between the two driven pulleys 54.

As shown in FIGS. 9A and 9B, the direction of drive pulley 53 rotation when turning counterclockwise as seen from the right is referred to below as the first direction of rotation Da1, and the direction of rotation when turning clockwise is second direction of rotation Da2. Likewise, the direction of endless belt 56 rotation when travelling counterclockwise as seen from the right is referred to below as the first direction of travel Db1, and the direction of rotation when travelling clockwise is second direction of travel Db2.

When the peeling unit moving motor 51 of the peeling unit moving unit 7 rotationally drives the drive pulley 53 in the first direction of rotation Da1, the endless belt 56 moves in the first direction of travel Db1, and the peeling unit 6 moves from the end peeling position to the start peeling position (see FIG. 9A). As described above, when the label paper P is held by the holding unit 3 and the peeling conveyance motor 31 conveys the label paper P forward, the peeling unit 6 is pushed by the label paper P and moves from the start peeling position to the end peeling position. At this time, the endless belt 56 travels in the second direction of travel Db2, and the drive pulley 53 turns in the second direction of rotation Da2 (see FIG. 9B).

The torque limiter 57 is coaxially connected to the left side of the moving gear 52. The torque limiter 57 limits the torque in the second direction of rotation Da2 of the drive pulley 53 to a set torque limit. As a result, when the peeling unit 6 moves from the start peeling position to the end peeling position, a substantially constant load is applied to the peeling unit 6. Tension corresponding to the load applied to the peeling unit 6 by the torque limiter 57 is therefore applied to the label paper P folded back by the peeling member 28. As a result, the label paper P can be appropriately folded back by the peeling member 28.

The linear encoder 8 detects the position of the peeling unit 6 on the front-back axis. The linear encoder 8 includes a linear scale 58 and linear detector 59. The linear scale 58 is disposed above the right guide rail 5 and substantially parallel to the right guide rail 5. More specifically, the linear scale 58 extends between the start peeling position and end the peeling position.

The linear scale 58 has a scale of slits (not shown in the figure). The linear detector 59 is disposed at the top of the right mount 34. A photo interrupter, for example, may be used as the linear detector 59. The linear encoder 8 outputs a pulse signal to a controller 60 in conjunction with movement of the peeling unit 6.

The slack detector 9 detects slack in the label paper P between the peeling member 28 and peeling drive roller 32. A microswitch, for example, may be used as the slack detector 9. The detection probe 44 of the slack detector 9 protrudes from the detector window 43 as described above.

When the slack in the label paper P between the peeling member 28 and peeling drive roller 32 is less than a specific amount, the detection probe 44 is pushed by the label paper P and recedes into the detector window 43, and the slack detector 9 turns on. That there is less than the specific amount of slack in the label paper P, or more specifically that there is no slack in the label paper P, is thus detected.

However, if the slack in the label paper P between the peeling member 28 and peeling drive roller 32 exceeds this specific amount, the detection probe 44 protrudes from the detector window 43, and the slack detector 9 turns off. That the slack in the label paper P exceeds the limit, or more specifically that there is slack in the label paper P, is thus detected.

The label detector 11 detects if a label Pb has been removed from the liner Pa. The label detector 11 is disposed at the top of the peeler cover 47 in the middle between the left and right ends. A reflective photo interrupter, for example, may be used as the label detector 11. The label detector 11 outputs a Low signal to the controller 60 described further below when a label Pb is left on the liner Pa. If the label Pb has been removed from the liner Pa, the label detector 11 outputs a High signal to the controller 60. The Low and High output states of the detection signal may be reversed.

The control system of the label peeling device 1 according to this embodiment is described next with reference to FIG. 10. As shown in FIG. 10, the label peeling device 1 has a controller 60 and a communication unit 70.

The communication unit 70 is communicatively connected between the controller 60 and an external device such as the label printer 100. The communication unit 70 receives and supplies data from the external device to the controller 60.

The controller 60 includes a CPU (central processing unit) and memory. The gripping motor 21, peeling conveyance motor 31, and peeling unit moving motor 51 are connected through drivers not shown to the output side of the controller 60.

The controller 60 functionally includes a peeling distance setting unit 61, a movement distance setting unit 62, a movement distance computing unit 63, and a motor control unit 64. These function units are embodied by the hardware of the controller 60 and software stored in memory.

The peeling distance setting unit 61 sets a peeling distance A. The movement distance setting unit 62 sets a peeling unit movement distance C by adding a specific additional distance B to the peeling distance A.

The peeling distance A, additional distance B, and peeling unit movement distance C are described next with reference to FIG. 11.

The peeling distance A is the distance at which a label Pb separates from the liner Pa in the lengthwise direction of the label paper P. The peeling distance setting unit 61 may set the peeling distance Abased on the length of the label Pb acquired from the label printer 100, or based on a value input by the user, for example. Note that peeling distance A is preferably slightly shorter than the label Pb.

The additional distance B is equal to the distance between the peeling member 28 when the peeling unit 6 is at the start peeling position, and the downstream end of the label Pb. More specifically, the peeling member 28 starts moving from the additional distance B downstream from the downstream end of the label Pb. Note that the additional distance B may be 0 mm, but is preferably several millimeters so that peeling starts reliably from the downstream end of the label Pb.

The peeling unit movement distance C is the distance between the start peeling position and the end peeling position of the peeling unit 6.

By counting the pulse signals output from the linear encoder 8, the movement distance computing unit 63 calculates the position from the peeling unit 6 to the start peeling position or the end peeling position, that is, the distance the peeling unit 6 has moved.

The motor control unit 64 controls driving of the gripping motor 21, peeling conveyance motor 31, and peeling unit moving motor 51.

To move the peeling unit 6 from the start peeling position to the end peeling position, the motor control unit 64 moves the peeling unit 6 the peeling unit movement distance C set by the movement distance setting unit 62. The motor control unit 64 therefore controls driving the peeling conveyance motor 31 based on the movement distance of the peeling unit 6 output from the movement distance computing unit 63. As a result, the peeling unit 6 can be moved from the start peeling position to the end peeling position according to the peeling unit movement distance C that was set. The peeling unit 6 therefore moves from the start peeling position to the end peeling position according to the length of the label Pb when the peeling distance setting unit 61 sets the peeling distance A based on the length of the label Pb. The amount corresponding to the length of the label Pb can therefore be peeled.

To move the peeling unit 6 from the end peeling position to the start peeling position, the motor control unit 64 moves the peeling unit 6 the peeling unit movement distance C set by the movement distance setting unit 62. The motor control unit 64 therefore controls driving the peeling unit moving motor 51 based on the movement distance of the peeling unit 6 outputs from the movement distance computing unit 63. As a result, the peeling unit 6 can be moved from the end peeling position to the start peeling position according to the peeling unit movement distance C that was set. The peeling unit 6 therefore moves from the end peeling position to the start peeling position according to the length of the label Pb when the peeling distance setting unit 61 sets the peeling distance A based on the length of the label Pb. For example, when the length of the label Pb is long, the start peeling position moves to a position further forward.

Note that the start peeling position may be fixed and the end peeling position may be changed according to the peeling unit movement distance C, or both the start peeling position and the end peeling position may change according to the peeling unit movement distance C.

When the label paper P is advanced by the peeling conveyance roller 46 and the label detector 11 outputs a Low signal, the motor control unit 64 blocks the driving of the peeling unit moving motor 51. More specifically, the motor control unit 64 prevents the driving of the peeling unit moving motor 51 after the peeling unit 6 moves from the start peeling position to the end peeling position if the label Pb has not been peeled from the liner Pa. This prevents a label Pb that was peeled from the liner Pa from sticking to the liner Pa again. If the label detector 11 outputs a High signal, that is, the label Pb was removed from the liner Pa, the motor control unit 64 enables the driving of the peeling unit moving motor 51.

As further described below, the motor control unit 64 also controls the peeling conveyance motor 31 based on the output of the slack detector 9.

The operation of the label peeling device 1 for peeling a label Pb from the liner Pa after an image is printed on the label Pb by the label printer 100 is described next with reference to FIGS. 12A-12D and FIGS. 13A-13D.

FIG. 12A shows a label Pb to be printed when positioned at the recording head 112. The holding unit 3 of the label peeling device 1 is in the release position. The peeling unit 6 is in the start peeling position.

From this position, the label printer 100 ejects ink from the recording head 112 to record an image on the label Pb while conveying the label paper P with the paper feed roller 109 as shown in FIG. 12B. At this time, the label peeling device 1 conveys the label paper P with slack by the peeling conveyance roller 46.

Next, as shown in FIG. 12C, the paper feed roller 109 and peeling conveyance roller 46 convey the label paper P forward with slack until the label Pb with the recorded image reaches the peeling position. The peeling position is the position where the downstream end of the label Pb is located additional distance B upstream from the peeling member 28. As a result, when the label paper P is delivered from the label printer 100, excess slack developing in the label paper P can be prevented by the peeling conveyance roller 46 feeding the label paper P forward.

Next, as shown in FIG. 12D, the holding unit 3 goes to the holding position and the label paper P is held by the holding unit 3.

While the holding unit 3 continues holding the label paper P, the peeling conveyance roller 46 feeds the label paper P the peeling unit movement distance C while the label paper P is kept taut as shown in FIG. 13A. As a result, the peeling unit 6 moves from the start peeling position to the end peeling position. As a result, the label Pb is peeled the peeling distance A from the downstream end.

Note that when the peeling unit 6 is at the end peeling position, the upstream end of the label Pb remains affixed to the liner Pa.

Next, as shown in FIG. 13B, the label Pb is removed from the liner Pa by the user. The user can therefore get a label Pb that has been desirably printed. When the label Pb is removed from the liner Pa, the label detector 11 outputs a High signal to the controller 60. As a result, the motor control unit 64 allows driving the peeling unit moving motor 51 again.

Next, as shown in FIG. 13C, the peeling unit moving unit 7 moves the peeling unit 6 peeling unit movement distance C from the end peeling position to the start peeling position while reversing the label paper P with the peeling conveyance roller 46. The distance the label paper P is fed at this time is sufficient to assure there is slack in the label paper P even after the peeling unit 6 returns to the start peeling position. By the peeling conveyance roller 46 reversing the label paper P simultaneously with the peeling unit 6 moving from the end peeling position to the start peeling position, the peeling unit 6 can move smoothly without interference from the label paper P even if the label paper P is still held by the holding unit 3 when the peeling unit 6 moves from the end peeling position to the start peeling position. Note that there is no need for the label paper P to be reversed simultaneously with the peeling unit 6 moving from the end peeling position to the start peeling position, and the peeling unit 6 may be moved after the label paper P is reversed.

Next, as shown in FIG. 13D, the holding unit 3 is moved to the release position by driving the gripping motor 21 and moving the gripping member 19 to the release position. The label paper P is then reversed with slack therein by the paper feed roller 109 and peeling conveyance roller 46 until the next label Pb reaches the start printing position. This completes the complete operating sequence for printing and peeling one label Pb.

As described above, when the label paper P is conveyed with the holding unit 3 in the release position, the label peeling device 1 conveys the label paper P with slack. As a result, creating a difference between the actual conveyance distance of the label paper P and the rotational feed distance of the paper feed roller 109, that is, the outside circumference of the paper feed roller 109 multiplied by the number of paper feed roller 109 revolutions, can be suppressed. This is described further below.

Conveying the label paper P forward is described next. As shown in FIG. 14A, starting with the slack detector 9 off, the label paper P is conveyed forward with the rotational conveyance speed Vpe of the peeling conveyance roller 46 greater than the rotational conveyance speed Vpf of the paper feed roller 109. As a result, the slack in the label paper P decreases between the paper feed roller 109 and peeling conveyance roller 46.

Note that the rotational conveyance speed Vpf of the paper feed roller 109 is the product of the outside circumference of the paper feed roller 109 multiplied by the rotational speed of the paper feed roller 109. The rotational conveyance speed Vpe of the peeling conveyance roller 46 is the product of the outside circumference of the peeling conveyance roller 46 multiplied by the rotational speed of the peeling conveyance roller 46.

As shown in FIG. 14B, when the slack in the label paper P becomes less than the specific amount, the slack detector 9 turns on and No Slack is detected. When the slack detector 9 is on, the motor control unit 64 stops the peeling conveyance roller 46. As a result, the peeling conveyance roller 46 stops forward conveyance of the label paper P. The paper feed roller 109 continues turning at this time. As a result, the slack in the label paper P increases.

As shown in FIG. 14C, when the slack in the label paper P reaches the specific amount, the slack detector 9 turns off and slack is detected in the label paper P.

As shown in FIG. 14A, when the slack detector 9 turns off, the motor control unit 64 resumes driving the peeling conveyance roller 46 after a delay, that is, after waiting a specific time. As a result, the peeling conveyance roller 46 resumes feeding the label paper P forward.

A specific amount or more of slack can therefore be constantly maintained by repeating this process. The actual conveyance of the label paper P becoming greater than the rotational conveyance distance of the paper feed roller 109 during forward conveyance can therefore be suppressed.

Reverse conveyance of the label paper P is described next. As shown in FIG. 15A, starting with the slack detector 9 on, the label paper P is conveyed in reverse with the rotational conveyance speed Vpe of the peeling conveyance roller 46 greater than the rotational conveyance speed Vpf of the paper feed roller 109. As a result, the slack in the label paper P increases between the paper feed roller 109 and peeling conveyance roller 46.

As shown in FIG. 15B, when the slack in the label paper P equals or exceeds the specific amount, the slack detector 9 turns off and slack in the label paper P is detected.

As shown in FIG. 15C, when the slack detector 9 then turns off, the motor control unit 64 stops driving the peeling conveyance roller 46 after a delay, that is, after waiting a specific time. As a result, the peeling conveyance roller 46 stops back feeding the label paper P. The paper feed roller 109 continues turning at this time. As a result, the slack in the label paper P decreases.

When the slack in the label paper P is less than the specific amount as shown in FIG. 15A and the slack detector 9 turns on, No Slack is detected. When the slack detector 9 turns on, the motor control unit 64 resumes driving the peeling conveyance roller 46. As a result, the peeling conveyance roller 46 resumes reversing the label paper P. By repeating this process, a specific amount of slack can be constantly maintained. The actual conveyance of the label paper P becoming less than the rotational conveyance distance of the paper feed roller 109 during reverse conveyance can therefore be suppressed.

As described above, with the label peeling device 1 according to this embodiment, the peeling unit 6 moves from the start peeling position to the end peeling position by being pushed by the label paper P according to the conveyance speed of the label paper P by the peeling conveyance roller 46. Therefore, the peeling member 28 separating from the label paper P is suppressed, and excess slack developing in the label paper P is suppressed. As a result, the label paper P can be reliably folded back by the peeling member 28. In addition, the labels Pb can be reliably peeled from the liner Pa.

The invention is not limited to the foregoing and can be modified as described below.

For example, a configuration in which the peeling conveyance roller 46 does not move and only the peeling member 28 moves between the start peeling position and end peeling position is conceivable.

Further alternatively, the label peeling device 1 may be incorporated in the label printer 100. More specifically, the label printer 100 may be configured with the holding unit 3, peeling unit 6, and other parts of the label peeling device 1.

The fluid ejection device is also not limited to one that ejects ink, and may eject any desirable fluid, including coating agents and other types of fluids.

The invention being thus described, it will be apparent that it may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifications as would be apparent to one skilled in the art are intended to be included within the scope of the following claims. 

What is claimed is:
 1. A label peeling device configured to peel a label from a liner to which the label is affixed, the label peeling device comprising: a peeling member disposed in a conveyance path of the liner and configured to move between a first position and a second position, and to fold back the liner; and a conveyance roller disposed on a downstream side of the peeling member in the conveyance path and configured to hold the liner and to rotate; wherein the peeling member moves from the first position to the second position when being pushed by the liner, the liner pushing the peeling member when the conveyance roller holds the liner and the conveyance roller rotates while the liner is being held at a location along the liner on an upstream side of the peeling member in the conveyance path such that a portion of the liner that is upstream of the location does not travel in the conveyance path, and the label is peeled from the liner when the peeling member moves from the first position to the second position.
 2. The label peeling device described in claim 1, further comprising: a holding unit disposed on the upstream side of the peeling member and configured to move between a holding position where the holding unit holds the liner, and a release position where the holding unit does not hold the liner; wherein the holding unit is at the holding position to hold the liner as holding on the upstream side of the peeling member in the conveyance path when the peeling member moves from the first position to the second position.
 3. The label peeling device described in claim 2, wherein: the peeling member is disposed rockably in a plane substantially parallel to a portion of the conveyance path measured from the holding unit to the peeling member.
 4. The label peeling device described in claim 1, further comprising: a torque limiter that applies a load resisting movement of the peeling member from the first position to the second position.
 5. The label peeling device described in claim 4, further comprising: a drive source; a pulley configured to rotate in a first direction of rotation and a second direction of rotation; wherein, the drive source drives the pulley in the first direction, the peeling member moves from the second position to the first positon by a drive power transferred from the pulley in the first direction, and the torque limiter is connected to the pulley and limits a torque of the pulley in the second direction.
 6. A fluid ejection device comprising: a fluid ejection unit configured to eject fluid onto a label affixed to a liner; and a peeling member disposed in a conveyance path of the liner and configured to move between a first position and a second position, and to fold back the liner; a conveyance roller disposed on a downstream side of the peeling member in a conveyance path configured to hold the liner and rotate; wherein the peeling member moves from the first position to the second position when being pushed by the liner, the liner pushing the peeling member when the conveyance roller holds the liner and the conveyance roller rotates while the liner is being held by a holding unit at a location of the liner such that a portion of the liner that is upstream of the location does not travel in the conveyance path, and the label is peeled from the liner when the peeling member moves from the first position to the second position.
 7. A peeling method of a label peeling device configured to peel a label from a liner to which the label is affixed, the label peeling device having a peeling member disposed in a conveyance path of the liner and configured to move between a first position and a second position, and to fold back the liner, and a conveyance roller disposed on a downstream side of the peeling member in the conveyance path and configured to hold the liner and rotate, the peeling method comprising: moving the peeling member from the first position to the second position including: a step of holding the liner at a location along the liner on an upstream side of the peeling member in the conveyance path such that a portion of the liner that is upstream of the location does not travel in the conveyance path, and a step of controlling the conveyance roller, while the liner is pushing the peeling member, to hold the liner and to rotate while the liner is on the upstream side of the peeling member in the conveyance path; wherein, the label is peeled from the liner when the peeling member moves from the first position to the second position when being pushed by the liner, the liner pushing the peeling member.
 8. The peeling method of a label peeling device described in claim 7, wherein: the label peeling device further comprises a holding unit disposed on the upstream side of the peeling member, configured to move between a holding position in which the holding unit holds the liner and a release position in which the holding unit does not hold the liner; and the step of holding the label paper on the upstream side of the peeling member in the conveyance path causes the holding unit to move to the holding position. 